This platform won’t work unless garages upload on the customer’s behalf, just like MOT history.
The original farmer owner of his new 1983 Defender didn’t know it was going to become a loved classic, so he would never bother creating an account to track the history of his car.
The wealthy original owner of a 1968 Mercedes SL Pagoda didn’t plan to keep it for more than 3 years so he didn’t want to create an account.
You need to find a way to incentivise garages to upload to the platform so it can become a central database of car history. Perhaps by having recommended/approved garages for certain car models and in return for the extra awareness raised they use the platform.